Şenol Yılmaz - Academia.edu (original) (raw)

Papers by Şenol Yılmaz

Bu calismada, gabro esasli cam ve cam-seramik malzemelerin uretim imkânlari arastirilmistir. Bu a... more Bu calismada, gabro esasli cam ve cam-seramik malzemelerin uretim imkânlari arastirilmistir. Bu amacla gabroya MgO, Al2O3, B2O3 ve P2O5 katilarak 2 farkli bilesim hazirlanmis, hazirlanan bu bilesimler 1500 °C’de ergitilerek gabro esasli camlar elde edilmistir. Bu camlara, 1000 °C’de 3 saat ve 1000 °C 3 saat + 1100 °C 3 saat olmak uzere 2 farkli isil islem programi uygulanarak cam-seramik donusumleri gerceklestirilmistir. Cam ve cam-seramik malzemelerin X-isinlari difraksiyonu (XRD) ile faz yapilari incelenmistir. Ayrica cam ve cam-seramik malzemelerin sertlik ve kirilma toklugu olcumleri de yapilmistir. XRD ile yapilan karakterizasyonlar ile ergitme sonrasi gabro esasli malzemelerin camsi amorf yapida oldugu belirlenmistir. Isil islemler sonrasinda ise cam-seramik donusumunun gerceklestigi, kristal fazlarin cam matriste cokeldikleri gorulmus olup sertlik ve kirilma tokluklarinda da artislar tespit edilmistir

Journal of Non-Crystalline Solids, 2018

This study investigates the utilization of basalt in manufacturing machinable glass ceramics. As ... more This study investigates the utilization of basalt in manufacturing machinable glass ceramics. As the fluorine and potassium phases, MgF 2 and K 2 O added into basalt are responsible for the machinability of glass ceramics. Three different compositions containing 80%, 85%, and 90% basalt, with K 2 O and MgF 2 as the remainder, were mixed and melted in an alumina crucible at 1500°C. Glass samples were obtained by casting the melt into a graphite mould. Glass ceramics were prepared through subsequent crystallization heat treatment of the obtained glass. Compositional and mechanical characterizations were carried out via XRD-SEM and hardness/fracture toughness and machinability tests respectively. The effect of change in the obtained phases with basalt composition on the machinability of glass ceramics was investigated. Furthermore, crystallization kinetics of the glasses were investigated by differential thermal analysis (DTA) using the Kissinger kinetic model with several different heating rates. This study reports that basalt can be utilized in the production of machinable glass ceramics only if the basalt ratio is justified. The results showed that good machining performance was observed in low-basalt content conditions (B80), When the basalt content increased (B85 and B90), the machining capability decreased markedly. Furthermore, the crystallization activation energies decreased with increase in basalt content.

AIP Conference Proceedings, 2017

In the current study, the effect of particle size and velocity on solid particle erosive wear pro... more In the current study, the effect of particle size and velocity on solid particle erosive wear properties of glass-ceramics produced from cast basalt was investigated. The samples sectioned as the size of 50 x 50 x 12 mm were used for experimental studies. The samples were fixed 20 mm distance from the nozzle, and then they were eroded at 30°,60°,90° impact angle by using alumina erosive media size of 106-150 μm and 63-106 μm in different spray pressure 1.5, 3 and 4 bar for 20 sec. The particle size and velocity parameters were affected wear rates of basalt base glass-ceramics.

Sakarya Üniversitesi Fen Bilimleri Enstitüsü Dergisi, Jun 1, 2009

... Akın Akıncı a, *, S. Hakan Yetgin b , Şenol Yılmaz a ve Uğur Şen a ... Bahadur ve diğerleri [... more ... Akın Akıncı a, *, S. Hakan Yetgin b , Şenol Yılmaz a ve Uğur Şen a ... Bahadur ve diğerleri [4], çeşitli bakır oksit ve çinko bileşik dolguları içeren polyester malzemelerin, atmosferik koşullarda, 1 m/s kayma hızında, çelik yüzey üzerindeki aşınma Page 2. SAÜ. ...

Sakarya University Journal of Science, Jun 1, 2001

Bu calismada, metalurjinin tarihcesi vearkeometalurji hakkinda bilgiler verilmektedir. Tarihte il... more Bu calismada, metalurjinin tarihcesi vearkeometalurji hakkinda bilgiler verilmektedir. Tarihte ilk kullaniJan metaller tanitilmakta,insanoglunun bunlari kesfetmesiyle yasanunda mey dana gelen degisimJer sunolmakta ve metalurjiningunumuze degin gecirdigi surecler anlatilmaktadir.

Materials Testing, 2015

This study investigated a new production technology for Iznik tiles. High quartz content of Iznik... more This study investigated a new production technology for Iznik tiles. High quartz content of Iznik tiles was kept as it was and hydraulic pressing instead of tapping was used for shaping. Besides the traditional pouring technique, tiles were also glazed by spray coating. Characterization of the Iznik tiles were approached using different methodologies, including scanning electron microscopy plus energy dispersive X-ray spectrometry (SEM-EDX), Raman spectroscopy, atomic force microscopy (AFM), X-ray diffractometry (XRD) and dilatometry. Characterization results revealed that thermal expansion coefficients (TECs) of body, slip layer (thinned siliceous clay) and frit are 8.41, 8.48 and 8.32 × 10−6 K−1, respectively, and matched which is fundamental to achieve increase in strength and keep the glaze in compressive stress. Raman signatures of the Iznik tiles agreed with the literature information. By double layer spray coating, smoother surfaces can be obtained on Iznik tiles than by trad...

Acta Physica Polonica A, 2015

Glass-ceramics were produced by sintering method from industrial waste materials such as y ash, b... more Glass-ceramics were produced by sintering method from industrial waste materials such as y ash, blast furnace slag and boron waste. The sintering behavior and machinability of glass-ceramic compositions were investigated. Additives were added to waste materials for enhancement of machinability and sintering properties. All starting materials were mixed by ball milling for 2 h using alumina media. The mixed and milled powders were sieved to grain sizes smaller than 75 µm and pressed at 100 MPa. The pressed samples were sintered at 900 • C, 1000 • C and 1100 • C for 1 h in an electric furnace using a heating rate of 5 • C/min. Some characterization tests such as X-ray diraction (XRD), scanning electron microscopy (SEM) and machinability tests were performed on sintered samples. The results indicated that all samples exhibit good sintering and machinability properties.

Key Engineering Materials, 2004

The present work deals with applicability of the fly ash (thermal power plant waste) as a coating... more The present work deals with applicability of the fly ash (thermal power plant waste) as a coating onto the steel substrates by means of plasma spray coating technology. Plasma sprayed fly ash coatings obtained with and without of different proportions of aluminum powder. Coating morphology characterized by optical microscopy and X-ray diffraction analysis was applied to determine crystalline phase constituents. Results reveal that possible use of thermal power plant waste fly ash as a thermally sprayed coating. The interface bond strength of coating performed by means of coating pull-out method showed that the addition of aluminum powder increases the bond strength.

Ceramics International, 2011

In the present study, the effect of SiC addition on properties of basalt base glass-ceramic coati... more In the present study, the effect of SiC addition on properties of basalt base glass-ceramic coating was investigated. SiC reinforced glass-ceramic coating was realized by atmospheric air plasma spray coating technique on AISI 1040 steel pre-coated with Ni + 5 wt.%Al bond coat. Composite powder mixture consisted of 10%, 20% and 30% SiC by weight were used for coating treatment. Controlled heat treatment for crystallization was realized on pre-coated samples in argon atmosphere at 800 8C, 900 8C and 1000 8C which determined by differential thermal analysis for 1-4 h in order to obtain to the glass-ceramic structure. Microstructural examination showed that the coating performed by plasma spray coating treatment and crystallized was crack free, homogeneous in macro-scale and good bonded. The hardness of the coated samples changed between 666 AE 27 and 873 AE 32 HV 0.01 depending on SiC addition and crystallization temperature. The more the SiC addition and the higher the treatment temperature, the harder the basalt base SiC reinforced glass-ceramic coating became. X-ray diffraction analysis showed that the coatings include augeite [(CaFeMg)-SiO 3 ], diopside [Ca(Mg 0.15 Fe 0.85)(SiO 3) 2 ], albite [(Na,Ca)Al(Si,Al) 3 O 8 ], andesine [Na 0.499 Ca 0.492 (Al 1.488 Si 2.506 O 8 ] and moissanite (SiC) phases. EDX analyses support the X-ray diffraction analysis.

Ceramics International, 2012

The crystallisation kinetics of the conversion of a glass coating layer made from a mixture of na... more The crystallisation kinetics of the conversion of a glass coating layer made from a mixture of natural basalt volcanic rock and SiC into glass-ceramic have been investigated. The process depends on the crystallisation temperature, time and amount of the SiC added. Coating powders were prepared from pure basalt and from basalt containing 10-50 wt% SiC. The powders were coated by an atmospheric plasma spray technique on the pre-coated AISI 1040 steel substrate with Ni-Al. The coating layer was vitrified by sudden cooling. The amorphous structure of the coatings was verified by X-ray diffraction (XRD) analysis. To obtain glass-ceramic, coatings were subjected to crystallisation heat treatment in an argon atmosphere. Crystallisation heat treatment temperatures of 800 1C, 900 1C and 1000 1C were chosen by using DTA. After the heat treatment process, augite, ferrian-diopsite, diopside, albite, andesine, and moissonite phases formed in the coating layer and were verified by XRD analysis. The crystallisation activation energies were determined to be between 323.4 kJ/mol and 253.2 kJ/mol, depending on SiC addition. The crystallisation activation energies decreased with increasing amounts of SiC addition. The Avrami parameters of the crystallisation process varied between 1.60 and 3.33, which indicates that internal crystallisation dominated for all of the compositions.

Materials Science-poland, 2007

The crystallization behaviour of SiO2–MgO–3CaO–P2O5–Al2O3–ZrO2 glass was studied using glass samp... more The crystallization behaviour of SiO2–MgO–3CaO–P2O5–Al2O3–ZrO2 glass was studied using glass samples prepared by melting reagent grade SiO2, MgO, Ca5(PO4)3OH, P2O5, Al2O3 and ZrO2. DTA and XRD analysis revealed the crystallization of whitlockite, anorthite and baddeleyite phases. The crystallization kinetics was studied by applying the DTA measurements carried out at various heating rates. The activation energies of crystallization and viscous flow were measured as 209 kJ·mol –1 and 356 kJ·mol –1 , respectively. The resultant SiO2–MgO–3CaO–P2O5–Al2O3–ZrO2 glass-ceramics revealed very fine and homogenous microstructure.

Porcelain is a material produced from kaolinitic clay, quartz and feldspar. Recently, research on... more Porcelain is a material produced from kaolinitic clay, quartz and feldspar. Recently, research on new materials such as nonhazardous wastes and natural rocks have been focused on replacing traditional constituents without changing the process or quality of the final products. The aim of this study is to investigate the possibility of the use of volcanic basalt rock in porcelain production. Quartz was progressively replaced by up to 20 wt.% basalt in a traditional porcelain composition. The samples were sintered in an electric furnace with a heating rate of 5 οK minute at 1100, 1150, 1200, 1250 and 1300 οC for 2 h. The effects of this substitution were investigated by measuring the linear shrinkage, bulk density and apparent porosity. The sintered samples were also characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis. The effects of this substitution on sintering and microstructural properties are studied. According to the experimental results line...

Glass-ceramic was produced by sintering method from vermiculite, K2CO3 and MgF2. The sintering be... more Glass-ceramic was produced by sintering method from vermiculite, K2CO3 and MgF2. The sintering behavior and machinability of glass-ceramic composition was investigated. The starting materials were mixed together and milled in an alumina mill for 2 h. Then the powders were sieved to grain sizes smaller than 75 μm. For the sintering route, disc samples were prepared by pressing at 100 MPa. The pressed discs were sintered at 1100 1300 °C for 2 h in an electric furnace using a heating rate of 5 °C/min. Some characterization tests such as X-ray diffraction (XRD), scanning electron microscopy (SEM) and machinability tests were performed on sintered samples. The results indicated that all samples exhibits good sintering and machinability properties.

Journal of Thermal Analysis and Calorimetry, 2018

Solid oxide fuel cell (SOFC) is a very efficient and clean source of energy. The glass and glass-... more Solid oxide fuel cell (SOFC) is a very efficient and clean source of energy. The glass and glass-ceramics are the most suitable and compatible sealing materials for SOFC. The crystallization kinetics of glass sealants is an essential parameter to check the suitability of glass as a sealant. In this study, the crystallization behavior of a novel sealing glass developed from the volcanic rock basalt suitable as an SOFC sealant is investigated via differential thermal analysis using the Kissinger kinetic model with several different heating rates. Development of crystalline phases on thermal treatments of the glass at various temperatures has been followed by X-ray diffraction. Augite and diopside are the primary crystalline phases in crystallized glass-ceramic seals. The results show that the basalt base glass-ceramic sealant material exhibited promising properties to use for SOFC.

Acta Physica Polonica A, 2017

In this study, the effect of impact angle of the particles on solid particle erosive wear propert... more In this study, the effect of impact angle of the particles on solid particle erosive wear properties of basalt base glass-ceramics used for industrial applications was investigated. Commercial basalt glass-ceramic materials size of 20 × 20 × 3 cm was sectioned to the size of 5 × 5 × 1.2 cm. The experimental procedure was performed by using erosive wear test device with nozzle diameter of 0.78 cm. Na feldspar size of 300 µm was used as erosive media. The samples were fixed 2 cm distance from the nozzle, Na feldspar particles were sprayed by using 1.5, 3, 4 bar pressure for 20 s. The tests were repeated with 30 • +45 • +60 • +75 • +90 • impact angles. The erosive wear rates were measured and the effect of particle impact angle on wear properties was determined.

AIP Conference Proceedings, 2017

Basalt based glass-ceramics were prepared by conventional melt-quenching technique and subsequent... more Basalt based glass-ceramics were prepared by conventional melt-quenching technique and subsequently converted to glass-ceramics by a controlled nucleation and crystallization process. Glass materials were obtained by melt at 1500ºC and quenched in cold water. The powder materials were made by milling and spin coating. The powders were applied on the 430 stainless steel interconnector material, and heat treatment was carried out. The interface characteristics between the glass-ceramic layer and interconnector were investigated by using X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM). The results showed that the basalt base glass-ceramic sealant material exhibited promising properties to use for SOFC.

Scientific Research and Essays, Jun 4, 2011

Materials & Design, 2011

In this study, slurry erosion behaviors of basalt filled low density polyethylene composites were... more In this study, slurry erosion behaviors of basalt filled low density polyethylene composites were investigated. Pure low density polyethylene and four different compositions of the composites 10 wt.%, 30 wt.%, 50 wt.% and 70 wt.% basalt were used in the study. Slurry wear, tensile strain, hardness and fracture toughness tests were performed on the samples. Samples turns in the abraded slurry media including 50 wt.% Al 2 O 3 with nominal particle size of 500 lm and the erosion tests of pure low density polyethylene and basalt filled composites were performed at the contact angles of 15°, 30°, 45°, 60°, 75°and 90°for 30 min. in 3 periods at 500 rpm turning speed (1 m/s speed). It was observed that erosion rate have no effect up to 30 wt.% basalt content. Wear resistance of the composites including over 30 wt.% basalt were micro structural examination of the worn samples showed that the basalt particles on the worn surface can be sustained by matrix. Basalt particles were worn more slowly than that of the matrix. The more the basalt content in the basalt filled low density polyethylene resulted to the lower the tensile strength, tensile strain and fracture toughness, and the higher the hardness. The slurry erosion rate of the basalt filled low density polyethylene composites was getting sharply increase above 30 wt.% basalt content above 60°contact angle.

Materials & Design, 2006

... J Euro Ceram Soc, 17 (1997), pp. 147–152. [13] S. Yılmaz, M. Ipek, G. Celebi and C. Bindal, T... more ... J Euro Ceram Soc, 17 (1997), pp. 147–152. [13] S. Yılmaz, M. Ipek, G. Celebi and C. Bindal, The effect of bond coat on mechanical properties of plasma sprayed Al 2 O 3 and Al 2 O 3 –13 wt% TiO 2 coatings on AISI 316L stainless steel. Vacuum, 77 (2005), pp. 315–321. ...

International Journal of Applied Ceramic Technology, 2011

ABSTRACT Grain growth kinetics of the glass–ceramics produced from fly ash of Seyitömer power pla... more ABSTRACT Grain growth kinetics of the glass–ceramics produced from fly ash of Seyitömer power plant in Turkey has been investigated. In this process, fly ash was melted and casted as glass. Produced glass materials were heat treated at 1073, 1123, and 1173 K for 30–240 min in order to produce glass–ceramic. The phases formed in the glass–ceramics were diopsite and augite. Grain growth activation energy of the glass–ceramic was 320 kJ/mol. Grain growth exponents (n) of the glass–ceramics were changing between 3.322 and 5.076 depending on treatment time and temperature.

Bu calismada, gabro esasli cam ve cam-seramik malzemelerin uretim imkânlari arastirilmistir. Bu a... more Bu calismada, gabro esasli cam ve cam-seramik malzemelerin uretim imkânlari arastirilmistir. Bu amacla gabroya MgO, Al2O3, B2O3 ve P2O5 katilarak 2 farkli bilesim hazirlanmis, hazirlanan bu bilesimler 1500 °C’de ergitilerek gabro esasli camlar elde edilmistir. Bu camlara, 1000 °C’de 3 saat ve 1000 °C 3 saat + 1100 °C 3 saat olmak uzere 2 farkli isil islem programi uygulanarak cam-seramik donusumleri gerceklestirilmistir. Cam ve cam-seramik malzemelerin X-isinlari difraksiyonu (XRD) ile faz yapilari incelenmistir. Ayrica cam ve cam-seramik malzemelerin sertlik ve kirilma toklugu olcumleri de yapilmistir. XRD ile yapilan karakterizasyonlar ile ergitme sonrasi gabro esasli malzemelerin camsi amorf yapida oldugu belirlenmistir. Isil islemler sonrasinda ise cam-seramik donusumunun gerceklestigi, kristal fazlarin cam matriste cokeldikleri gorulmus olup sertlik ve kirilma tokluklarinda da artislar tespit edilmistir

Journal of Non-Crystalline Solids, 2018

This study investigates the utilization of basalt in manufacturing machinable glass ceramics. As ... more This study investigates the utilization of basalt in manufacturing machinable glass ceramics. As the fluorine and potassium phases, MgF 2 and K 2 O added into basalt are responsible for the machinability of glass ceramics. Three different compositions containing 80%, 85%, and 90% basalt, with K 2 O and MgF 2 as the remainder, were mixed and melted in an alumina crucible at 1500°C. Glass samples were obtained by casting the melt into a graphite mould. Glass ceramics were prepared through subsequent crystallization heat treatment of the obtained glass. Compositional and mechanical characterizations were carried out via XRD-SEM and hardness/fracture toughness and machinability tests respectively. The effect of change in the obtained phases with basalt composition on the machinability of glass ceramics was investigated. Furthermore, crystallization kinetics of the glasses were investigated by differential thermal analysis (DTA) using the Kissinger kinetic model with several different heating rates. This study reports that basalt can be utilized in the production of machinable glass ceramics only if the basalt ratio is justified. The results showed that good machining performance was observed in low-basalt content conditions (B80), When the basalt content increased (B85 and B90), the machining capability decreased markedly. Furthermore, the crystallization activation energies decreased with increase in basalt content.

AIP Conference Proceedings, 2017

In the current study, the effect of particle size and velocity on solid particle erosive wear pro... more In the current study, the effect of particle size and velocity on solid particle erosive wear properties of glass-ceramics produced from cast basalt was investigated. The samples sectioned as the size of 50 x 50 x 12 mm were used for experimental studies. The samples were fixed 20 mm distance from the nozzle, and then they were eroded at 30°,60°,90° impact angle by using alumina erosive media size of 106-150 μm and 63-106 μm in different spray pressure 1.5, 3 and 4 bar for 20 sec. The particle size and velocity parameters were affected wear rates of basalt base glass-ceramics.

Sakarya Üniversitesi Fen Bilimleri Enstitüsü Dergisi, Jun 1, 2009

... Akın Akıncı a, *, S. Hakan Yetgin b , Şenol Yılmaz a ve Uğur Şen a ... Bahadur ve diğerleri [... more ... Akın Akıncı a, *, S. Hakan Yetgin b , Şenol Yılmaz a ve Uğur Şen a ... Bahadur ve diğerleri [4], çeşitli bakır oksit ve çinko bileşik dolguları içeren polyester malzemelerin, atmosferik koşullarda, 1 m/s kayma hızında, çelik yüzey üzerindeki aşınma Page 2. SAÜ. ...

Sakarya University Journal of Science, Jun 1, 2001

Bu calismada, metalurjinin tarihcesi vearkeometalurji hakkinda bilgiler verilmektedir. Tarihte il... more Bu calismada, metalurjinin tarihcesi vearkeometalurji hakkinda bilgiler verilmektedir. Tarihte ilk kullaniJan metaller tanitilmakta,insanoglunun bunlari kesfetmesiyle yasanunda mey dana gelen degisimJer sunolmakta ve metalurjiningunumuze degin gecirdigi surecler anlatilmaktadir.

Materials Testing, 2015

This study investigated a new production technology for Iznik tiles. High quartz content of Iznik... more This study investigated a new production technology for Iznik tiles. High quartz content of Iznik tiles was kept as it was and hydraulic pressing instead of tapping was used for shaping. Besides the traditional pouring technique, tiles were also glazed by spray coating. Characterization of the Iznik tiles were approached using different methodologies, including scanning electron microscopy plus energy dispersive X-ray spectrometry (SEM-EDX), Raman spectroscopy, atomic force microscopy (AFM), X-ray diffractometry (XRD) and dilatometry. Characterization results revealed that thermal expansion coefficients (TECs) of body, slip layer (thinned siliceous clay) and frit are 8.41, 8.48 and 8.32 × 10−6 K−1, respectively, and matched which is fundamental to achieve increase in strength and keep the glaze in compressive stress. Raman signatures of the Iznik tiles agreed with the literature information. By double layer spray coating, smoother surfaces can be obtained on Iznik tiles than by trad...

Acta Physica Polonica A, 2015

Glass-ceramics were produced by sintering method from industrial waste materials such as y ash, b... more Glass-ceramics were produced by sintering method from industrial waste materials such as y ash, blast furnace slag and boron waste. The sintering behavior and machinability of glass-ceramic compositions were investigated. Additives were added to waste materials for enhancement of machinability and sintering properties. All starting materials were mixed by ball milling for 2 h using alumina media. The mixed and milled powders were sieved to grain sizes smaller than 75 µm and pressed at 100 MPa. The pressed samples were sintered at 900 • C, 1000 • C and 1100 • C for 1 h in an electric furnace using a heating rate of 5 • C/min. Some characterization tests such as X-ray diraction (XRD), scanning electron microscopy (SEM) and machinability tests were performed on sintered samples. The results indicated that all samples exhibit good sintering and machinability properties.

Key Engineering Materials, 2004

The present work deals with applicability of the fly ash (thermal power plant waste) as a coating... more The present work deals with applicability of the fly ash (thermal power plant waste) as a coating onto the steel substrates by means of plasma spray coating technology. Plasma sprayed fly ash coatings obtained with and without of different proportions of aluminum powder. Coating morphology characterized by optical microscopy and X-ray diffraction analysis was applied to determine crystalline phase constituents. Results reveal that possible use of thermal power plant waste fly ash as a thermally sprayed coating. The interface bond strength of coating performed by means of coating pull-out method showed that the addition of aluminum powder increases the bond strength.

Ceramics International, 2011

In the present study, the effect of SiC addition on properties of basalt base glass-ceramic coati... more In the present study, the effect of SiC addition on properties of basalt base glass-ceramic coating was investigated. SiC reinforced glass-ceramic coating was realized by atmospheric air plasma spray coating technique on AISI 1040 steel pre-coated with Ni + 5 wt.%Al bond coat. Composite powder mixture consisted of 10%, 20% and 30% SiC by weight were used for coating treatment. Controlled heat treatment for crystallization was realized on pre-coated samples in argon atmosphere at 800 8C, 900 8C and 1000 8C which determined by differential thermal analysis for 1-4 h in order to obtain to the glass-ceramic structure. Microstructural examination showed that the coating performed by plasma spray coating treatment and crystallized was crack free, homogeneous in macro-scale and good bonded. The hardness of the coated samples changed between 666 AE 27 and 873 AE 32 HV 0.01 depending on SiC addition and crystallization temperature. The more the SiC addition and the higher the treatment temperature, the harder the basalt base SiC reinforced glass-ceramic coating became. X-ray diffraction analysis showed that the coatings include augeite [(CaFeMg)-SiO 3 ], diopside [Ca(Mg 0.15 Fe 0.85)(SiO 3) 2 ], albite [(Na,Ca)Al(Si,Al) 3 O 8 ], andesine [Na 0.499 Ca 0.492 (Al 1.488 Si 2.506 O 8 ] and moissanite (SiC) phases. EDX analyses support the X-ray diffraction analysis.

Ceramics International, 2012

The crystallisation kinetics of the conversion of a glass coating layer made from a mixture of na... more The crystallisation kinetics of the conversion of a glass coating layer made from a mixture of natural basalt volcanic rock and SiC into glass-ceramic have been investigated. The process depends on the crystallisation temperature, time and amount of the SiC added. Coating powders were prepared from pure basalt and from basalt containing 10-50 wt% SiC. The powders were coated by an atmospheric plasma spray technique on the pre-coated AISI 1040 steel substrate with Ni-Al. The coating layer was vitrified by sudden cooling. The amorphous structure of the coatings was verified by X-ray diffraction (XRD) analysis. To obtain glass-ceramic, coatings were subjected to crystallisation heat treatment in an argon atmosphere. Crystallisation heat treatment temperatures of 800 1C, 900 1C and 1000 1C were chosen by using DTA. After the heat treatment process, augite, ferrian-diopsite, diopside, albite, andesine, and moissonite phases formed in the coating layer and were verified by XRD analysis. The crystallisation activation energies were determined to be between 323.4 kJ/mol and 253.2 kJ/mol, depending on SiC addition. The crystallisation activation energies decreased with increasing amounts of SiC addition. The Avrami parameters of the crystallisation process varied between 1.60 and 3.33, which indicates that internal crystallisation dominated for all of the compositions.

Materials Science-poland, 2007

The crystallization behaviour of SiO2–MgO–3CaO–P2O5–Al2O3–ZrO2 glass was studied using glass samp... more The crystallization behaviour of SiO2–MgO–3CaO–P2O5–Al2O3–ZrO2 glass was studied using glass samples prepared by melting reagent grade SiO2, MgO, Ca5(PO4)3OH, P2O5, Al2O3 and ZrO2. DTA and XRD analysis revealed the crystallization of whitlockite, anorthite and baddeleyite phases. The crystallization kinetics was studied by applying the DTA measurements carried out at various heating rates. The activation energies of crystallization and viscous flow were measured as 209 kJ·mol –1 and 356 kJ·mol –1 , respectively. The resultant SiO2–MgO–3CaO–P2O5–Al2O3–ZrO2 glass-ceramics revealed very fine and homogenous microstructure.

Porcelain is a material produced from kaolinitic clay, quartz and feldspar. Recently, research on... more Porcelain is a material produced from kaolinitic clay, quartz and feldspar. Recently, research on new materials such as nonhazardous wastes and natural rocks have been focused on replacing traditional constituents without changing the process or quality of the final products. The aim of this study is to investigate the possibility of the use of volcanic basalt rock in porcelain production. Quartz was progressively replaced by up to 20 wt.% basalt in a traditional porcelain composition. The samples were sintered in an electric furnace with a heating rate of 5 οK minute at 1100, 1150, 1200, 1250 and 1300 οC for 2 h. The effects of this substitution were investigated by measuring the linear shrinkage, bulk density and apparent porosity. The sintered samples were also characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis. The effects of this substitution on sintering and microstructural properties are studied. According to the experimental results line...

Glass-ceramic was produced by sintering method from vermiculite, K2CO3 and MgF2. The sintering be... more Glass-ceramic was produced by sintering method from vermiculite, K2CO3 and MgF2. The sintering behavior and machinability of glass-ceramic composition was investigated. The starting materials were mixed together and milled in an alumina mill for 2 h. Then the powders were sieved to grain sizes smaller than 75 μm. For the sintering route, disc samples were prepared by pressing at 100 MPa. The pressed discs were sintered at 1100 1300 °C for 2 h in an electric furnace using a heating rate of 5 °C/min. Some characterization tests such as X-ray diffraction (XRD), scanning electron microscopy (SEM) and machinability tests were performed on sintered samples. The results indicated that all samples exhibits good sintering and machinability properties.

Journal of Thermal Analysis and Calorimetry, 2018

Solid oxide fuel cell (SOFC) is a very efficient and clean source of energy. The glass and glass-... more Solid oxide fuel cell (SOFC) is a very efficient and clean source of energy. The glass and glass-ceramics are the most suitable and compatible sealing materials for SOFC. The crystallization kinetics of glass sealants is an essential parameter to check the suitability of glass as a sealant. In this study, the crystallization behavior of a novel sealing glass developed from the volcanic rock basalt suitable as an SOFC sealant is investigated via differential thermal analysis using the Kissinger kinetic model with several different heating rates. Development of crystalline phases on thermal treatments of the glass at various temperatures has been followed by X-ray diffraction. Augite and diopside are the primary crystalline phases in crystallized glass-ceramic seals. The results show that the basalt base glass-ceramic sealant material exhibited promising properties to use for SOFC.

Acta Physica Polonica A, 2017

In this study, the effect of impact angle of the particles on solid particle erosive wear propert... more In this study, the effect of impact angle of the particles on solid particle erosive wear properties of basalt base glass-ceramics used for industrial applications was investigated. Commercial basalt glass-ceramic materials size of 20 × 20 × 3 cm was sectioned to the size of 5 × 5 × 1.2 cm. The experimental procedure was performed by using erosive wear test device with nozzle diameter of 0.78 cm. Na feldspar size of 300 µm was used as erosive media. The samples were fixed 2 cm distance from the nozzle, Na feldspar particles were sprayed by using 1.5, 3, 4 bar pressure for 20 s. The tests were repeated with 30 • +45 • +60 • +75 • +90 • impact angles. The erosive wear rates were measured and the effect of particle impact angle on wear properties was determined.

AIP Conference Proceedings, 2017

Basalt based glass-ceramics were prepared by conventional melt-quenching technique and subsequent... more Basalt based glass-ceramics were prepared by conventional melt-quenching technique and subsequently converted to glass-ceramics by a controlled nucleation and crystallization process. Glass materials were obtained by melt at 1500ºC and quenched in cold water. The powder materials were made by milling and spin coating. The powders were applied on the 430 stainless steel interconnector material, and heat treatment was carried out. The interface characteristics between the glass-ceramic layer and interconnector were investigated by using X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM). The results showed that the basalt base glass-ceramic sealant material exhibited promising properties to use for SOFC.

Scientific Research and Essays, Jun 4, 2011

Materials & Design, 2011

In this study, slurry erosion behaviors of basalt filled low density polyethylene composites were... more In this study, slurry erosion behaviors of basalt filled low density polyethylene composites were investigated. Pure low density polyethylene and four different compositions of the composites 10 wt.%, 30 wt.%, 50 wt.% and 70 wt.% basalt were used in the study. Slurry wear, tensile strain, hardness and fracture toughness tests were performed on the samples. Samples turns in the abraded slurry media including 50 wt.% Al 2 O 3 with nominal particle size of 500 lm and the erosion tests of pure low density polyethylene and basalt filled composites were performed at the contact angles of 15°, 30°, 45°, 60°, 75°and 90°for 30 min. in 3 periods at 500 rpm turning speed (1 m/s speed). It was observed that erosion rate have no effect up to 30 wt.% basalt content. Wear resistance of the composites including over 30 wt.% basalt were micro structural examination of the worn samples showed that the basalt particles on the worn surface can be sustained by matrix. Basalt particles were worn more slowly than that of the matrix. The more the basalt content in the basalt filled low density polyethylene resulted to the lower the tensile strength, tensile strain and fracture toughness, and the higher the hardness. The slurry erosion rate of the basalt filled low density polyethylene composites was getting sharply increase above 30 wt.% basalt content above 60°contact angle.

Materials & Design, 2006

... J Euro Ceram Soc, 17 (1997), pp. 147–152. [13] S. Yılmaz, M. Ipek, G. Celebi and C. Bindal, T... more ... J Euro Ceram Soc, 17 (1997), pp. 147–152. [13] S. Yılmaz, M. Ipek, G. Celebi and C. Bindal, The effect of bond coat on mechanical properties of plasma sprayed Al 2 O 3 and Al 2 O 3 –13 wt% TiO 2 coatings on AISI 316L stainless steel. Vacuum, 77 (2005), pp. 315–321. ...

International Journal of Applied Ceramic Technology, 2011

ABSTRACT Grain growth kinetics of the glass–ceramics produced from fly ash of Seyitömer power pla... more ABSTRACT Grain growth kinetics of the glass–ceramics produced from fly ash of Seyitömer power plant in Turkey has been investigated. In this process, fly ash was melted and casted as glass. Produced glass materials were heat treated at 1073, 1123, and 1173 K for 30–240 min in order to produce glass–ceramic. The phases formed in the glass–ceramics were diopsite and augite. Grain growth activation energy of the glass–ceramic was 320 kJ/mol. Grain growth exponents (n) of the glass–ceramics were changing between 3.322 and 5.076 depending on treatment time and temperature.